def __init__(self, config: Config):
Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.
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坚持马克思主义立场观点方法是理论创新的必然要求
The earliest launch opportunity is now in April - but Nasa said the exact date would depend on how long the technical work would take.